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Relay valves.
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Supply line.
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Emergency air line.
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Steering wheel.
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Texas CDL Permit Test - Combination
(From the 2020 Texas CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Texas Commercial Motor Vehicle Drivers Handbook. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
advertising
1.
The service air line is attached to the:
2.
Rollovers happen when:
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A truck driver is driving too fast.
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The driver of a vehicle in front of a truck is moving to slowly.
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A truck driver is driving too slowly.
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ABS is working effectively.
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3.
When coupling a trailer:
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Make sure to couple matching glad hands.
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Any glad hand can be connected to any other glad hand.
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It is best to leave one glad hand unattached.
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Only one set of glad hands should be connected.
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4.
Large combination vehicles take the longest amount of time to stop:
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When fully loaded.
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When partially loaded.
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When empty.
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When mostly loaded.
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5.
What is a tractor protection valve?
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A valve to keep air in the brake system should there be a bad leak
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A valve that prevents the truck from being stolen
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A valve that prevents the driver from going too fast
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A valve that prevents the trailer from accidentally being released
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6.
When driving a bobtail tractor, you should be aware that:
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Bobtails stop very easily.
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Bobtails cannot drive as fast as tractors with semitrailers.
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Bobtails are more difficult to stop than tractors with semitrailers.
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Bobtails are illegal in most states.
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7.
To help prevent rollovers, you should:
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Accelerate quickly after stopping.
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Drive slowly around turns.
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Keep the load near the back of the trailer.
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Keep the load on one side of the trailer.
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